2 files changed, 147 insertions, 290 deletions

diff --git a/crates/test_utils/src/fixture.rs b/crates/test_utils/src/fixture.rs
new file mode 100644
index 000000000..7e93fbcd6
--- /dev/null
+++ b/crates/test_utils/src/fixture.rs
@@ -0,0 +1,142 @@
+//! Defines `Fixture` -- a convenient way to describe the initial state of
+//! rust-analyzer database from a single string.
+
+use rustc_hash::FxHashMap;
+use stdx::{lines_with_ends, split_delim, trim_indent};
+
+#[derive(Debug, Eq, PartialEq)]
+pub struct Fixture {
+    pub path: String,
+    pub text: String,
+    pub crate_name: Option<String>,
+    pub deps: Vec<String>,
+    pub cfg_atoms: Vec<String>,
+    pub cfg_key_values: Vec<(String, String)>,
+    pub edition: Option<String>,
+    pub env: FxHashMap<String, String>,
+}
+
+impl Fixture {
+    /// Parses text which looks like this:
+    ///
+    ///  ```not_rust
+    ///  //- some meta
+    ///  line 1
+    ///  line 2
+    ///  // - other meta
+    ///  ```
+    pub fn parse(ra_fixture: &str) -> Vec<Fixture> {
+        let fixture = trim_indent(ra_fixture);
+
+        let mut res: Vec<Fixture> = Vec::new();
+
+        let default = if ra_fixture.contains("//-") { None } else { Some("//- /main.rs") };
+
+        for (ix, line) in default.into_iter().chain(lines_with_ends(&fixture)).enumerate() {
+            if line.contains("//-") {
+                assert!(
+                    line.starts_with("//-"),
+                    "Metadata line {} has invalid indentation. \
+                     All metadata lines need to have the same indentation.\n\
+                     The offending line: {:?}",
+                    ix,
+                    line
+                );
+            }
+
+            if line.starts_with("//-") {
+                let meta = Fixture::parse_meta_line(line);
+                res.push(meta)
+            } else if let Some(entry) = res.last_mut() {
+                entry.text.push_str(line);
+            }
+        }
+
+        res
+    }
+
+    //- /lib.rs crate:foo deps:bar,baz cfg:foo=a,bar=b env:OUTDIR=path/to,OTHER=foo
+    pub fn parse_meta_line(meta: &str) -> Fixture {
+        assert!(meta.starts_with("//-"));
+        let meta = meta["//-".len()..].trim();
+        let components = meta.split_ascii_whitespace().collect::<Vec<_>>();
+
+        let path = components[0].to_string();
+        assert!(path.starts_with("/"));
+
+        let mut krate = None;
+        let mut deps = Vec::new();
+        let mut edition = None;
+        let mut cfg_atoms = Vec::new();
+        let mut cfg_key_values = Vec::new();
+        let mut env = FxHashMap::default();
+        for component in components[1..].iter() {
+            let (key, value) = split_delim(component, ':').unwrap();
+            match key {
+                "crate" => krate = Some(value.to_string()),
+                "deps" => deps = value.split(',').map(|it| it.to_string()).collect(),
+                "edition" => edition = Some(value.to_string()),
+                "cfg" => {
+                    for entry in value.split(',') {
+                        match split_delim(entry, '=') {
+                            Some((k, v)) => cfg_key_values.push((k.to_string(), v.to_string())),
+                            None => cfg_atoms.push(entry.to_string()),
+                        }
+                    }
+                }
+                "env" => {
+                    for key in value.split(',') {
+                        if let Some((k, v)) = split_delim(key, '=') {
+                            env.insert(k.into(), v.into());
+                        }
+                    }
+                }
+                _ => panic!("bad component: {:?}", component),
+            }
+        }
+
+        Fixture {
+            path,
+            text: String::new(),
+            crate_name: krate,
+            deps,
+            cfg_atoms,
+            cfg_key_values,
+            edition,
+            env,
+        }
+    }
+}
+
+#[test]
+#[should_panic]
+fn parse_fixture_checks_further_indented_metadata() {
+    Fixture::parse(
+        r"
+        //- /lib.rs
+          mod bar;
+
+          fn foo() {}
+          //- /bar.rs
+          pub fn baz() {}
+          ",
+    );
+}
+
+#[test]
+fn parse_fixture_gets_full_meta() {
+    let parsed = Fixture::parse(
+        r"
+    //- /lib.rs crate:foo deps:bar,baz cfg:foo=a,bar=b,atom env:OUTDIR=path/to,OTHER=foo
+    mod m;
+    ",
+    );
+    assert_eq!(1, parsed.len());
+
+    let meta = &parsed[0];
+    assert_eq!("mod m;\n", meta.text);
+
+    assert_eq!("foo", meta.crate_name.as_ref().unwrap());
+    assert_eq!("/lib.rs", meta.path);
+    assert_eq!(2, meta.env.len());
+}
diff --git a/crates/test_utils/src/lib.rs b/crates/test_utils/src/lib.rs
index fd917e43b..eaeeeb97b 100644
--- a/crates/test_utils/src/lib.rs
+++ b/crates/test_utils/src/lib.rs
@@ -8,6 +8,7 @@
 
 #[macro_use]
 pub mod mark;
+mod fixture;
 
 use std::{
     env, fs,
@@ -15,13 +16,12 @@ use std::{
 };
 
 use serde_json::Value;
-use stdx::split1;
 use text_size::{TextRange, TextSize};
 
-pub use ra_cfg::CfgOptions;
+pub use difference::Changeset as __Changeset;
 pub use rustc_hash::FxHashMap;
 
-pub use difference::Changeset as __Changeset;
+pub use crate::fixture::Fixture;
 
 pub const CURSOR_MARKER: &str = "<|>";
 
@@ -43,7 +43,7 @@ macro_rules! assert_eq_text {
             if left.trim() == right.trim() {
                 eprintln!("Left:\n{:?}\n\nRight:\n{:?}\n\nWhitespace difference\n", left, right);
             } else {
-                let changeset = $crate::__Changeset::new(right, left, "\n");
+                let changeset = $crate::__Changeset::new(left, right, "\n");
                 eprintln!("Left:\n{}\n\nRight:\n{}\n\nDiff:\n{}\n", left, right, changeset);
             }
             eprintln!($($tt)*);
@@ -97,7 +97,7 @@ impl From<RangeOrOffset> for TextRange {
     fn from(selection: RangeOrOffset) -> Self {
         match selection {
             RangeOrOffset::Range(it) => it,
-            RangeOrOffset::Offset(it) => TextRange::new(it, it),
+            RangeOrOffset::Offset(it) => TextRange::empty(it),
         }
     }
 }
@@ -159,291 +159,6 @@ pub fn add_cursor(text: &str, offset: TextSize) -> String {
     res
 }
 
-#[derive(Debug, Eq, PartialEq)]
-pub struct FixtureEntry {
-    pub meta: FixtureMeta,
-    pub text: String,
-}
-
-#[derive(Debug, Eq, PartialEq)]
-pub enum FixtureMeta {
-    Root { path: String },
-    File(FileMeta),
-}
-
-#[derive(Debug, Eq, PartialEq)]
-pub struct FileMeta {
-    pub path: String,
-    pub crate_name: Option<String>,
-    pub deps: Vec<String>,
-    pub cfg: CfgOptions,
-    pub edition: Option<String>,
-    pub env: FxHashMap<String, String>,
-}
-
-impl FixtureMeta {
-    pub fn path(&self) -> &str {
-        match self {
-            FixtureMeta::Root { path } => &path,
-            FixtureMeta::File(f) => &f.path,
-        }
-    }
-
-    pub fn crate_name(&self) -> Option<&String> {
-        match self {
-            FixtureMeta::File(f) => f.crate_name.as_ref(),
-            _ => None,
-        }
-    }
-
-    pub fn cfg_options(&self) -> Option<&CfgOptions> {
-        match self {
-            FixtureMeta::File(f) => Some(&f.cfg),
-            _ => None,
-        }
-    }
-
-    pub fn edition(&self) -> Option<&String> {
-        match self {
-            FixtureMeta::File(f) => f.edition.as_ref(),
-            _ => None,
-        }
-    }
-
-    pub fn env(&self) -> impl Iterator<Item = (&String, &String)> {
-        struct EnvIter<'a> {
-            iter: Option<std::collections::hash_map::Iter<'a, String, String>>,
-        }
-
-        impl<'a> EnvIter<'a> {
-            fn new(meta: &'a FixtureMeta) -> Self {
-                Self {
-                    iter: match meta {
-                        FixtureMeta::File(f) => Some(f.env.iter()),
-                        _ => None,
-                    },
-                }
-            }
-        }
-
-        impl<'a> Iterator for EnvIter<'a> {
-            type Item = (&'a String, &'a String);
-            fn next(&mut self) -> Option<Self::Item> {
-                self.iter.as_mut().and_then(|i| i.next())
-            }
-        }
-
-        EnvIter::new(self)
-    }
-}
-
-/// Parses text which looks like this:
-///
-///  ```not_rust
-///  //- some meta
-///  line 1
-///  line 2
-///  // - other meta
-///  ```
-pub fn parse_fixture(ra_fixture: &str) -> Vec<FixtureEntry> {
-    let fixture = indent_first_line(ra_fixture);
-    let margin = fixture_margin(&fixture);
-
-    let mut lines = fixture
-        .split('\n') // don't use `.lines` to not drop `\r\n`
-        .enumerate()
-        .filter_map(|(ix, line)| {
-            if line.len() >= margin {
-                assert!(line[..margin].trim().is_empty());
-                let line_content = &line[margin..];
-                if !line_content.starts_with("//-") {
-                    assert!(
-                        !line_content.contains("//-"),
-                        r#"Metadata line {} has invalid indentation. All metadata lines need to have the same indentation.
-The offending line: {:?}"#,
-                        ix,
-                        line
-                    );
-                }
-                Some(line_content)
-            } else {
-                assert!(line.trim().is_empty());
-                None
-            }
-        });
-
-    let mut res: Vec<FixtureEntry> = Vec::new();
-    for line in lines.by_ref() {
-        if line.starts_with("//-") {
-            let meta = line["//-".len()..].trim().to_string();
-            let meta = parse_meta(&meta);
-            res.push(FixtureEntry { meta, text: String::new() })
-        } else if let Some(entry) = res.last_mut() {
-            entry.text.push_str(line);
-            entry.text.push('\n');
-        }
-    }
-    res
-}
-
-//- /lib.rs crate:foo deps:bar,baz cfg:foo=a,bar=b env:OUTDIR=path/to,OTHER=foo
-fn parse_meta(meta: &str) -> FixtureMeta {
-    let components = meta.split_ascii_whitespace().collect::<Vec<_>>();
-
-    if components[0] == "root" {
-        let path = components[1].to_string();
-        assert!(path.starts_with("/") && path.ends_with("/"));
-        return FixtureMeta::Root { path };
-    }
-
-    let path = components[0].to_string();
-    assert!(path.starts_with("/"));
-
-    let mut krate = None;
-    let mut deps = Vec::new();
-    let mut edition = None;
-    let mut cfg = CfgOptions::default();
-    let mut env = FxHashMap::default();
-    for component in components[1..].iter() {
-        let (key, value) = split1(component, ':').unwrap();
-        match key {
-            "crate" => krate = Some(value.to_string()),
-            "deps" => deps = value.split(',').map(|it| it.to_string()).collect(),
-            "edition" => edition = Some(value.to_string()),
-            "cfg" => {
-                for key in value.split(',') {
-                    match split1(key, '=') {
-                        None => cfg.insert_atom(key.into()),
-                        Some((k, v)) => cfg.insert_key_value(k.into(), v.into()),
-                    }
-                }
-            }
-            "env" => {
-                for key in value.split(',') {
-                    if let Some((k, v)) = split1(key, '=') {
-                        env.insert(k.into(), v.into());
-                    }
-                }
-            }
-            _ => panic!("bad component: {:?}", component),
-        }
-    }
-
-    FixtureMeta::File(FileMeta { path, crate_name: krate, deps, edition, cfg, env })
-}
-
-/// Adjusts the indentation of the first line to the minimum indentation of the rest of the lines.
-/// This allows fixtures to start off in a different indentation, e.g. to align the first line with
-/// the other lines visually:
-/// ```
-/// let fixture = "//- /lib.rs
-///                mod foo;
-///                //- /foo.rs
-///                fn bar() {}
-/// ";
-/// assert_eq!(fixture_margin(fixture),
-/// "               //- /lib.rs
-///                mod foo;
-///                //- /foo.rs
-///                fn bar() {}
-/// ")
-/// ```
-fn indent_first_line(fixture: &str) -> String {
-    if fixture.is_empty() {
-        return String::new();
-    }
-    let mut lines = fixture.lines();
-    let first_line = lines.next().unwrap();
-    if first_line.contains("//-") {
-        let rest = lines.collect::<Vec<_>>().join("\n");
-        let fixed_margin = fixture_margin(&rest);
-        let fixed_indent = fixed_margin - indent_len(first_line);
-        format!("\n{}{}\n{}", " ".repeat(fixed_indent), first_line, rest)
-    } else {
-        fixture.to_owned()
-    }
-}
-
-fn fixture_margin(fixture: &str) -> usize {
-    fixture
-        .lines()
-        .filter(|it| it.trim_start().starts_with("//-"))
-        .map(indent_len)
-        .next()
-        .expect("empty fixture")
-}
-
-fn indent_len(s: &str) -> usize {
-    s.len() - s.trim_start().len()
-}
-
-#[test]
-#[should_panic]
-fn parse_fixture_checks_further_indented_metadata() {
-    parse_fixture(
-        r"
-        //- /lib.rs
-          mod bar;
-
-          fn foo() {}
-          //- /bar.rs
-          pub fn baz() {}
-          ",
-    );
-}
-
-#[test]
-fn parse_fixture_can_handle_dedented_first_line() {
-    let fixture = "//- /lib.rs
-                   mod foo;
-                   //- /foo.rs
-                   struct Bar;
-";
-    assert_eq!(
-        parse_fixture(fixture),
-        parse_fixture(
-            "//- /lib.rs
-mod foo;
-//- /foo.rs
-struct Bar;
-"
-        )
-    )
-}
-
-#[test]
-fn parse_fixture_gets_full_meta() {
-    let parsed = parse_fixture(
-        r"
-    //- /lib.rs crate:foo deps:bar,baz cfg:foo=a,bar=b,atom env:OUTDIR=path/to,OTHER=foo
-    mod m;
-    ",
-    );
-    assert_eq!(1, parsed.len());
-
-    let parsed = &parsed[0];
-    assert_eq!("mod m;\n\n", parsed.text);
-
-    let meta = &parsed.meta;
-    assert_eq!("foo", meta.crate_name().unwrap());
-    assert_eq!("/lib.rs", meta.path());
-    assert!(meta.cfg_options().is_some());
-    assert_eq!(2, meta.env().count());
-}
-
-/// Same as `parse_fixture`, except it allow empty fixture
-pub fn parse_single_fixture(ra_fixture: &str) -> Option<FixtureEntry> {
-    if !ra_fixture.lines().any(|it| it.trim_start().starts_with("//-")) {
-        return None;
-    }
-
-    let fixtures = parse_fixture(ra_fixture);
-    if fixtures.len() > 1 {
-        panic!("too many fixtures");
-    }
-    fixtures.into_iter().nth(0)
-}
-
 // Comparison functionality borrowed from cargo:
 
 /// Compare a line with an expected pattern.